Automatic drainage device for cable trench water-collecting well of power plant and use method of automatic drainage device

Abstract

The invention belongs to the technical field of drainage, and relates to an automatic drainage device of a power plant cable trench water-collecting well and a using method thereof. Comprising a water-collecting well body, and the water-collecting well body comprises a well wall, a well bottom, a well ring and a cover plate; the draining pump assembly comprises a motor, a motor base, a quick-release fixing support, a supporting cylinder, a transmission shaft, a pump body and a water outlet pipe. The motor base is installed on the well ring through a quick-release fixing support. The motor is installed on the motor base and located above the cover plate. One end of the supporting cylinder is connected with the motor base, and the other end of the supporting cylinder penetrates through the cover plate and overhangs into the water-collecting well body. One end of the transmission shaft is connected with the motor, and the other end of the transmission shaft is connected with the pump body; the water outlet pipe is connected with the pump body and extends out of the water collecting well body. According to the device, the real-time monitoring and automatic drainage functions of the water level in the water collecting well are achieved, the starting water level can be flexibly adjusted according to actual requirements, equipment abrasion is effectively reduced, and the service life is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of drainage technology and relates to an automatic drainage device for the water collection well of a power plant cable trench and its usage method. Background Technology

[0002] In power plants, cables are typically laid in cable trenches. To prevent water accumulation in the trenches, the bottom of the cable trenches is usually designed with a 2% transverse slope and a longitudinal slope of no less than 3‰, and 400×400×400mm water collection pits are installed approximately every 50m and at the lowest point. When there are no industrial wastewater wells within a 10m radius, or when the elevation difference between the drainage outlet of the water collection pit and the bottom elevation of the industrial wastewater well is no more than 1m, a water collection well needs to be installed near the water collection pit in the cable trench. Water accumulated in the trench is drained into the nearby water collection well through a buried drainage pipe with a diameter of no less than 200mm.

[0003] There are currently two common methods for draining accumulated water from sump pits: one is to use mobile drainage pumps, which are manually inspected and pumped out one by one at regular intervals; the other is to install fixed submersible pumps in the sump pits, which are automatically controlled to start and stop by setting the liquid level. However, mobile drainage pumps require timely manual inspection and observation of the water level in the sump pits, especially during periods of heavy rainfall, which requires frequent operation. This not only consumes a lot of manpower but may also lead to excessive water accumulation in the sump pits due to untimely inspections, thus affecting the normal use of the cable trench. Although fixed submersible pumps can achieve automatic start and stop control, existing equipment cannot flexibly adjust the starting water level according to seasonal changes and rainfall. At the same time, since the pump and motor are integrated, the motor and pump body need to be immersed in water for a long time. When the medium contains solid particles, sand, or other impurities, the pump body's flow-through components wear out quickly. If the water quality is corrosive, the pump body material is also easily corroded, thus shortening the equipment's service life. In addition, stationary submersible pumps are difficult to repair. Once a malfunction occurs, the entire pump usually needs to be hoisted from the bottom of the sump for repair. Moreover, they are expensive to manufacture, and the installation and maintenance costs are relatively high. Summary of the Invention

[0004] To address the problems in the prior art, this invention provides an automatic drainage device and its usage method for a water collection well in a power plant cable trench. The device enables real-time monitoring of the water level in the collection well and automatic drainage. It can flexibly adjust the starting water level according to actual needs, effectively reducing equipment wear and extending service life. It also features easy maintenance and relatively low cost.

[0005] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides an automatic drainage device for a power plant cable trench sump, comprising: The water collection well body includes a well wall, a well bottom, a well ring disposed on the top of the well wall, and a cover plate covering the well ring; A drainage pump assembly, comprising a motor, a motor mount, a quick-release mounting bracket, a support cylinder, a drive shaft, a pump body, and a water outlet pipe; The motor base is mounted on the well ring via the quick-release fixing bracket; the motor is mounted on the motor base and located above the cover plate; one end of the support cylinder is connected to the motor base, and the other end passes through the cover plate and extends into the water collection well body; the drive shaft passes through the inside of the support cylinder, and one end of the drive shaft is connected to the motor, and the other end is connected to the pump body; the water outlet pipe is connected to the pump body and extends to the outside of the water collection well body; A water level monitoring system is installed within the water collection well body; The control system is located outside the water collection well body; the control system is connected to the water level monitoring system and the motor respectively.

[0006] Preferably, the quick-release fixing bracket is fixedly installed on the well ring, and the motor base is installed on the quick-release fixing bracket by bolts.

[0007] Preferably, the quick-release fixing bracket is provided with a flange fixing plate, and the motor base is fixedly connected to one end of the support cylinder through the flange fixing plate.

[0008] Preferably, one end of the drive shaft is connected to the output shaft of the motor via a coupling, and the other end of the drive shaft passes through the cover plate and is connected to the pump body.

[0009] Preferably, one end of the outlet pipe is connected to the outlet of the pump body, and the other end of the outlet pipe extends upward and through the cover plate to the outside of the water collection well body.

[0010] Preferably, one end of the outlet pipe extending to the outside of the water collection well body is connected to the quick-release fixing bracket via the flange fixing plate.

[0011] Preferably, the water level monitoring system includes a hydrostatic level gauge and a waterproof cable; the hydrostatic level gauge is installed at the bottom of the well, the waterproof cable is laid along the well wall, and the hydrostatic level gauge is connected to the control system through the waterproof cable.

[0012] Preferably, the control system includes a liquid level control box; the liquid level control box is connected to the waterproof cable and the motor respectively.

[0013] Preferably, the device further includes a protective cover and a power supply cable, the protective cover being disposed outside the motor; the power supply cable being connected to the motor.

[0014] Secondly, the present invention provides a method for using an automatic drainage device for a power plant cable trench sump, comprising the following steps: The water level monitoring system installed inside the water collection well body monitors the water level inside the water collection well body in real time and generates a water level signal which is transmitted to the control system. The control system receives the water level signal. When the water level reaches the preset start-up water level, the control system controls the motor to start. The motor drives the pump body through the transmission shaft to discharge the water in the collection well body through the outlet pipe. When the water level drops to the preset stop water level, the control system controls the motor to stop working.

[0015] Compared with the prior art, the present invention has the following beneficial effects: By mounting the pump motor above the sump cover and connecting it to the pump body at the bottom of the well via a drive shaft inserted inside the support cylinder, a separate electromechanical arrangement is achieved. This completely isolates the motor from the water-filled environment below the well, fundamentally avoiding the insulation aging, corrosion, and short circuits caused by long-term immersion of the motor in traditional submersible pumps, and significantly extending the service life of the core power components. The motor mount is installed on the well ring via a quick-release bracket, and the support cylinder and outlet pipe are integrated into this bracket, allowing the entire drainage assembly to be quickly lifted and removed using simple bolt assembly and disassembly. When maintenance or repairs are required on the downhole pump or transmission mechanism, there is no need to damage the well cover structure or allow personnel to enter the well, greatly reducing maintenance difficulty and downtime. The water level monitoring system works in conjunction with the control system to automatically control the start and stop of the motor based on the real-time water level in the well, achieving fully unattended intelligent drainage operation. This not only avoids the labor intensity and response delay of manual inspections, but also allows for flexible adjustment of start and stop water level parameters through the control system to adapt to seasonal changes and actual water inflow conditions. While ensuring drainage needs, it reduces the frequency of motor start and stop, effectively reducing energy consumption and equipment wear. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional schematic diagram of an automatic drainage device for a power plant cable trench water collection well according to the present invention; Figure 2 for Figure 1 Top view; Figure 3 This is a schematic diagram of the flange fixing plate in this invention.

[0018] The components include: 1. Well wall; 2. Well bottom; 3. Well ring; 4. Cover plate; 5. Motor; 6. Motor base; 7. Coupling; 8. Quick-release bracket; 9. Protective cover; 10. Drive shaft; 11. Support cylinder; 12. Pump body; 13. Water outlet pipe; 14. Static pressure level gauge; 15. Waterproof cable; 16. Level control box; 17. Control panel; 18. Flange fixing plate; 19. Bolts; 20. Power supply cable; 21. Flooring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply refers to its direction relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings: The first objective of this invention is to provide an automatic drainage device for the sump of water in a power plant cable trench, such as... Figures 1-2 As shown, it includes: The water collection well body includes a well wall 1, a well bottom 2, a well ring 3 disposed on the top of the well wall 1, and a cover plate 4 covering the well ring 3; A drainage pump assembly, comprising a motor 5, a motor base 6, a quick-release fixing bracket 8, a support cylinder 11, a drive shaft 10, a pump body 12, and a water outlet pipe 13; The motor base 6 is mounted on the well ring 3 via the quick-release fixing bracket 8; the motor 5 is mounted on the motor base 6 and located above the cover plate 4; one end of the support cylinder 11 is connected to the motor base 6, and the other end passes through the cover plate 4 and extends into the water collection well body; the drive shaft 10 passes through the support cylinder 11, and one end of the drive shaft 10 is connected to the motor 5, and the other end is connected to the pump body 12; the water outlet pipe 13 is connected to the pump body 12 and extends to the outside of the water collection well body; A water level monitoring system is installed within the water collection well body; The control system is located outside the water collection well body; the control system is connected to the water level monitoring system and the motor 5 respectively.

[0026] This device mounts the motor 5 of the drainage pump above the cover plate 4 and mechanically connects it to the pump body 12 located at the bottom of the well 2 via the transmission shaft 10 passing through the support cylinder 11. Thus, based on the separate arrangement of electromechanical components, the motor base 6, support cylinder 11, and water outlet pipe 13 are integrated and installed at the well ring 3 through the quick-release fixing bracket 8. At the same time, with the cooperation of the intelligent monitoring unit consisting of the water level monitoring system and the control system, the motor 5 can be automatically controlled to start and stop according to the real-time changes in the water level in the well. This constitutes an automatic drainage solution that is compact, easy to maintain, and reliable in operation. Compared with the existing technology where the submersible pump is completely immersed in water, this invention places the motor 5 in a dry environment above the well, which fundamentally avoids the failures such as insulation aging, corrosion and short circuits caused by long-term immersion in water, and significantly extends the service life of the core power components. At the same time, the quick-release fixing bracket 8 enables the integrated installation of each component with the well ring 3. When maintenance is required on the pump body 12 or the transmission mechanism, there is no need to damage the cover plate 4 structure or hoist the heavy equipment as a whole. Only the connecting bolts 19 need to be removed to lift and move the entire drainage assembly out, which greatly reduces the difficulty and time cost of maintenance operations.

[0027] For example, the quick-release fixing bracket 8 is fixedly installed on the well ring 3. It can form a firm connection with the well ring 3 through pre-embedded parts or expansion bolts to ensure sufficient load-bearing rigidity. The motor base 6 is detachably installed on the quick-release fixing bracket 8 by bolts 19. This provides a structural foundation for the quick assembly and disassembly of the entire drainage assembly while ensuring stable support for the motor 5. This connection method makes full use of the reliability and convenience of bolt connections. When it is necessary to inspect or replace the equipment in the well, the maintenance personnel only need to loosen the bolts 19 from the surface to disassemble the equipment. In addition to the constraint between the motor base 6 and the quick-release fixing bracket 8, the entire set of components, including the motor 5, support cylinder 11, drive shaft 10, and pump body 12, can be lifted out of the water collection well as a whole. The entire process does not require damage to the well ring 3 or cover plate 4 structure, nor does it require personnel to go down into the well. This ensures operational safety while significantly reducing equipment downtime. Furthermore, the bolt 19 connection method allows for fine-tuning of the equipment position during installation, ensuring the coaxiality requirement between the drive shaft 10 and the output shaft of the motor 5, thereby reducing vibration and wear during operation and further improving transmission efficiency and service life.

[0028] For example, the quick-release fixing bracket 8 is provided with a flange fixing plate 18, and one end of the motor base 6 and the support cylinder 11 are fixedly connected by the flange fixing plate 18. In practical applications, the flange fixing plate 18 is usually bolted to tightly fit the connecting flanges of the two, which not only ensures the positioning accuracy of the drive shaft 10 in the support cylinder 11 and effectively transmits the torque output by the motor 5, but also accurately ensures the coaxiality between the drive shaft 10 and the output shaft of the motor 5 through the fit of the flange end faces, thereby significantly reducing the vibration and noise generated by the coupling 7 when rotating at high speed, and reducing the energy loss and mechanical wear of the transmission system. At the same time, this connection method allows the support cylinder 11 to be firmly suspended at the well ring 3 with the support of the quick-release fixing bracket 8, avoiding the bending deformation caused by the excessive length or weight of the support cylinder 11, and ensuring the smooth operation of the drive shaft 10; when maintenance of the downhole equipment is required, the detachable feature of the flange fixing plate 18 allows the operator to quickly separate or remove the support cylinder 11 from the motor base 6, providing great flexibility and convenience for maintenance operations.

[0029] For example, one end of the drive shaft 10 is connected to the output shaft of the motor 5 via a coupling 7, and the other end of the drive shaft 10 passes through the cover plate 4 and is connected to the pump body 12. This transmission arrangement uses a coupling as an intermediate link for power transmission, which can effectively compensate for possible minor installation errors or axial displacements between the motor output shaft and the drive shaft, and avoid additional stress caused by rigid connection. In actual operation, the rotational power output by the motor 5 is smoothly transmitted to the drive shaft 10, which passes through the support cylinder 11, via the coupling 7, thereby driving the pump body 12 located at the bottom of the well 2 to work. This achieves a split layout where the motor 5 is placed outside in a dry environment above the well while only the pump body 12 is immersed in water, fundamentally avoiding problems such as insulation aging, corrosion, and short circuits caused by motor immersion in traditional submersible pumps.

[0030] For example, one end of the outlet pipe 13 is connected to the outlet of the pump body 12, and the other end of the outlet pipe 13 extends upward and passes through the cover plate 4 to the outside of the collection well body. The outlet pipe 13 is usually laid upward along the side of the support cylinder 11 or parallel to it, and can be reliably connected to the support cylinder 11 through a fixed bracket to ensure its verticality and stability. When the pump body 12 is working under the drive of the motor 5, the water in the well is pressurized by the pump body 12 and enters the outlet pipe 13, flows upward along the pipe and finally passes through the cover plate 4 and is discharged into the factory drainage network, thereby realizing the functional requirement of raising the water in the collection well to the ground for discharge. At the same time, the outlet pipe 13 is made of corrosion-resistant materials such as plastic-coated composite steel pipe, which can adapt to the humid environment underground and resist the corrosion and wear that may be caused by the transported medium, further improving the operational reliability and service life of the entire drainage system.

[0031] For example, such as Figure 3 As shown, one end of the outlet pipe 13 extending outside the main body of the water collection well is connected to the quick-release fixing bracket 8 via the flange fixing plate 18. After passing through the cover plate 4, the outlet pipe 13 is flanged and connected to the quick-release fixing bracket 8 via the flange fixing plate 18. This not only effectively withstands the weight of the outlet pipe 13 itself and the vibration load generated by the water flow impact during drainage, preventing the pipe from bending or loosening due to excessive suspension, but also ensures the sealing of the connection between the outlet pipe 13 and the subsequent plant drainage network through the tight fit of the flange end face, preventing leakage during drainage.

[0032] For example, the water level monitoring system includes a hydrostatic level gauge 14 and a waterproof cable 15. The hydrostatic level gauge 14 is installed at the bottom of the well 2, and the waterproof cable 15 is laid along the well wall 1. The hydrostatic level gauge 14 is connected to the control system through the waterproof cable 15. Specifically, the hydrostatic level gauge 14 is typically made of corrosion-resistant material and fixedly installed at the lowest point of the well bottom 2 to ensure effective sensing of water pressure changes even at the lowest water level. Its output signal is transmitted to the level control box 16 located above the well via the waterproof cable 15 laid along the well wall 1. This wiring method effectively isolates the signal transmission line from the water environment below the well, avoiding signal attenuation or short circuit failures caused by long-term immersion of the cable. At the same time, the waterproof cable 15 laid along the well wall 1 is fixed with a dedicated cable clip or cable tray, which not only ensures the neatness and aesthetics of the wiring but also avoids the risk of the cable getting tangled with the drive shaft 10 or pump body 12 if it hangs haphazardly below the well.

[0033] For example, the control system includes a level control box 16; the level control box 16 is connected to the waterproof cable 15 and the motor 5 respectively. As the core unit of the control system, the level control box 16 is equipped with a programmable logic controller and is electrically connected to the external operation panel 17. The operator can input preset start and stop water level parameters to the controller in the level control box 16 through the operation panel 17. When the water level in the well reaches the preset start water level on the operation panel 17, the level control box 16 automatically starts the motor 5 to drive the pump body 12 to drain water according to the signal fed back by the hydrostatic level gauge 14. When the water level drops to the stop water level, it automatically stops, thereby realizing fully unattended automated operation.

[0034] For example, the device also includes a protective cover 9 and a power supply cable 20, the protective cover 9 being disposed outside the motor 5; the power supply cable 20 being connected to the motor 5.

[0035] Specifically, the protective cover 9 is usually made of weather-resistant materials such as stainless steel and is designed to be openable. It covers the outside of the motor 5 and can effectively resist the corrosion of the motor 5 by outdoor environmental factors such as wind, sand, rain, snow, dust and strong sunlight. It avoids poor heat dissipation, insulation degradation or electrical faults caused by foreign objects entering or moisture accumulation. At the same time, the openable top cover design allows operators to directly inspect the motor 5 or adjust the operating parameters through the operation panel 17 without removing the protective cover 9, thus achieving a balance between protective performance and operational convenience.

[0036] The power supply cable 20 is laid directly underground near the water collection well, on the outdoor ground 21, and is electrically connected to the motor 5 and the liquid level control box 16 to provide power. This laying method not only avoids the safety hazards that overhead lines may bring and the impact on the factory landscape, but also reduces the risk of cable damage or environmental corrosion by utilizing the protection and insulation of the soil layer.

[0037] The second objective of this invention is to provide a method for using an automatic drainage device for a power plant cable trench sump, comprising the following steps: The water level monitoring system installed inside the water collection well body monitors the water level inside the water collection well body in real time and generates a water level signal which is transmitted to the control system. The control system receives the water level signal. When the water level reaches the preset start-up water level, the control system controls the motor 5 to start. The motor 5 drives the pump body 12 through the transmission shaft 10 to discharge the water in the water collection well body through the outlet pipe 13. When the water level drops to the preset stop water level, the control system controls the motor 5 to stop working.

[0038] Specifically, it includes: The water level monitoring system installed in the water collection well monitors the water level changes in the well in real time and generates corresponding water level signals, which are transmitted to the control system. After receiving the water level signal, the control system compares it with the preset start and stop water level parameters through the operation panel 17. When the actual water level reaches the preset start water level, the control system automatically controls the motor 5 to start running. The motor 5 transmits power to the drive shaft 10 through the coupling 7, which in turn drives the pump body 12 to work, lifting the water in the water collection well through the outlet pipe 13 and discharging it to the plant's drainage network. As the drainage process continues, the water level in the well gradually decreases. When the signal from the static pressure level gauge 14 to the level control box 16 through the waterproof cable 15 shows that the water level has dropped to the preset stop water level, the control system immediately controls the motor 5 to stop working, thus completing a complete automatic drainage cycle.

[0039] This method fully utilizes the control system's real-time processing capability for water level signals, achieving full automation of the drainage operation. Operators only need to set the start and stop water levels once via the control panel 17 according to seasonal changes or actual water inflow conditions, allowing the device to operate in an unattended, intelligent state for extended periods. This not only avoids the labor intensity and slow response issues associated with manual drainage inspections but also effectively reduces the frequency of motor 5 starts and stops through water level control. While ensuring the collection well remains at a safe water level, it significantly reduces equipment wear and energy consumption. Furthermore, since the water level monitoring system uses a hydrostatic level gauge 14 to directly sense the water pressure at the bottom of the well 2, its measurement results are unaffected by water surface fluctuations or foam accumulation, ensuring the accuracy of water level judgment and the reliability of control. This provides a strong guarantee for the stable operation of the power plant's cable trench drainage system.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic drainage device for a power plant cable trench sump, characterized by, include: The water collection well body includes a well wall (1), a well bottom (2), a well ring (3) set on the top of the well wall (1), and a cover plate (4) covering the well ring (3). The drainage pump assembly includes a motor (5), a motor base (6), a quick-release fixing bracket (8), a support cylinder (11), a drive shaft (10), a pump body (12), and a water outlet pipe (13). The motor base (6) is mounted on the well ring (3) via the quick-release fixing bracket (8); the motor (5) is mounted on the motor base (6) and located above the cover plate (4); one end of the support cylinder (11) is connected to the motor base (6), and the other end passes through the cover plate (4) and extends into the water collection well body; the drive shaft (10) passes through the support cylinder (11), and one end of the drive shaft (10) is connected to the motor (5), and the other end is connected to the pump body (12); the water outlet pipe (13) is connected to the pump body (12) and extends to the outside of the water collection well body; A water level monitoring system is installed within the water collection well body; The control system is located outside the water collection well body; the control system is connected to the water level monitoring system and the motor (5) respectively.

2. An automatic drain device for a power plant cable trench sump according to claim 1, characterized in that, The quick-release fixing bracket (8) is fixedly installed on the well ring (3), and the motor base (6) is installed on the quick-release fixing bracket (8) by bolts (19).

3. An automatic drain device for a power plant cable trench sump according to claim 2, characterized in that, The quick-release fixing bracket (8) is provided with a flange fixing plate (18), and one end of the motor base (6) and the support cylinder (11) are fixedly connected through the flange fixing plate (18).

4. An automatic drain device for a power plant cable trench sump according to claim 1, characterized in that, One end of the drive shaft (10) is connected to the output shaft of the motor (5) via a coupling (7), and the other end of the drive shaft (10) passes through the cover plate (4) and is connected to the pump body (12).

5. An automatic drain device for a power plant cable trench sump well according to claim 1, characterized in that, One end of the outlet pipe (13) is connected to the outlet of the pump body (12), and the other end of the outlet pipe (13) extends upward and through the cover plate (4) to the outside of the water collection well body.

6. An automatic drain device for a power plant cable trench sump according to claim 5, characterized in that, The outlet pipe (13) extends to one end outside the water collection well body and is connected to the quick-release fixing bracket (8) through the flange fixing plate (18).

7. An automatic drain device for a power plant cable trench sump well according to claim 1, characterized in that, The water level monitoring system includes a static pressure level gauge (14) and a waterproof cable (15); the static pressure level gauge (14) is installed on the bottom of the well (2), and the waterproof cable (15) is laid along the well wall (1). The static pressure level gauge (14) is connected to the control system through the waterproof cable (15).

8. An automatic drainage device for a power plant cable trench sump according to claim 1, characterized in that, The control system includes a liquid level control box (16); the liquid level control box (16) is connected to the waterproof cable (15) and the motor (5) respectively.

9. An automatic drain device for a power plant cable trench sump well according to claim 1, characterized in that, The device also includes a protective cover (9) and a power supply cable (20), the protective cover (9) being placed over the motor (5); the power supply cable (20) being connected to the motor (5).

10. A method of using an automatic drain for a power plant cable trench sump according to any one of claims 1 to 9, characterized in that, Includes the following steps: The water level monitoring system installed inside the water collection well body monitors the water level inside the water collection well body in real time and generates a water level signal which is transmitted to the control system. The control system receives the water level signal. When the water level reaches the preset start water level, the control system controls the motor (5) to start. The motor (5) drives the pump body (12) to work through the transmission shaft (10) and discharges the water in the water collection well body through the outlet pipe (13). When the water level drops to the preset stop water level, the control system controls the motor (5) to stop working.

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